I am considering upgrading a basement circuit as illustrated to allow the two lights (L1 and L2) to be controlled by a switch (SW) while keeping the outlet O always hot. The current version has no switch and the lights are controlled by pull cords. To do this I’ve split the hot in two by using a 3-wire cable between L1 and L2. Is this NEC-compliant? Seems like it should be ok because the neutral (blue) won’t have any more current than it did before if all devices are on and the whole circuit can still be shut off from a single breaker.
In addition, I plan to replace the outlet O with a GFCI since it is in a basement. Will there be any problem with having a GFCI at the end of the circuit like this?